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United States Department of Transportation United States Department of Transportation

Advisory Circulars (ACs)

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Number, title, description, or office

Advisory Circulars (ACs) search results
Number Title Status Office Date
20-56A Marking of TSO-C72b Individual Flotation Devices

Outlines acceptable methods for marking individual flotation devices which also serve as seat cushions

Active AIR-120 1975-04-01
20-74 Aircraft Position and Anticollision Light Measurements

Contains useful information concerning measurements for intensity, covering, and color of aircraft position and anti-collision lights.

Active AIR-120 1971-07-29
20-174 Development of Civil Aircraft and Systems

This includes validation of requirements and verification of the design implementation for certification and process assurance.

Active AIR-120 2011-09-30
20-30B Aircraft Position Light and Anticollision Light Installations

Sets forth acceptable means, but not the only means, of showing compliance with the Federal Aviation Regulations (FAR) applicable to installed position lights and anti-collision lights.

Active AIR-120 1981-07-20
20-170 Integrated Modular Avionics Development. Verification, Integration and Approval using RTCA/DO-297 and Technical Standard Order C153

We cite RTCA, Inc. document RTCA/DO-297, Integrated Modular Avionics (IMA) Development Guidance and Certification Considerations, dated November 8, 2005 and supplement it with this text.

Active AIR-120 2010-10-28
20-157 How to Prepare Reliability Assessment Plans for Aircraft Systems and Equipment

This AC shows you how to develop and use a reliability assessment plan. An assessment plan documents the controlled, repeatable processes for assessing the reliability of aircraft and engine electronic and electrical systems, including their electromechanical elements and equipment.

Active AIR-120 2007-01-19
20-171 Alternatives to RTCA/DO-178B for Software in Airborne Systems and Equipment

RTCA/DO-178B is recognized by industry and certification authorities as an accepted approach for assuring that software in airborne systems and equipment has been developed to meet the safety objectives of the regulations.

Active AIR-120 2011-01-19
20-104 Revised Powerplant Engineering Report No. 3A Standard Fire Test Apparatus and Procedure (for Flexible Hose Assemblies)

Announces the availability of the subject report.

Active AIR-120 1978-07-19
20-71 Dual Locking Devices on Fasteners

Provides guidance and acceptable means, not the sole means, by which compliance may be shown with the requirements for dual locking devices on removable fasteners installed in rotorcraft and transport category airplanes.

Active AIR-120 1970-12-08
20-42D Hand Fire Extinguishers for Use in Aircraft

This advisory circular (AC) gives you guidance for the fire-fighting effectiveness, selection and safe-use of hand fire extinguishers in airplanes and rotorcraft.

Active AIR-120 2011-01-14
20-100 General Guidelines for Measuring Fire-Extinguishing Agent Concentrations in Powerplant Compartments

Describes the installation and use of a model GA-2A fire extinguisher agent concentration recorder in determining the distribution and concentration of fire-extinguishing agents when discharged in an aircraft powerplant compartment.

Active AIR-120 1977-09-21
21-34 Shoulder Harness-Safety Belt Installations

Provides information and guidance pertinent to an acceptable means, but not the only means, for installation of shoulder harness and safety belt restraint systems at all seat locations on all previously type-certificated aircraft.

Active AIR-120 1993-06-04
20-175 Controls for Flight Deck Systems

This AC addresses traditional dedicated controls such as physical switches and knobs, as well as multifunction controls such as touch screens and cursor control devices.

Active AIR-120 2011-12-08
91-62A Use of Child Seats in Aircraft

Provides information to assist the public in the proper use of child seats aboard aircraft and provides precautions so all occupants are able to exit rapidly from aircraft during emergencies.

Active AIR-120 1992-10-15
20-73A Aircraft Ice Protection

This advisory circular (AC) tells type certificate and supplemental type certificate applicants how to comply with the ice protection requirements of Title 14 of the Code of Federal Regulations (14 CFR) parts 23, 25, 27, 29, 33, and 35.

Active AIR-120 2006-08-16
20-168 Certification Guidance for Installation of Non-Essential, Non-Required Aircraft Cabin Systems & Equipment (CS&E)

This AC is not mandatory and does not constitute a regulation. In it we describe a means, though it is not the only means, for manufacturers and installers to show their equipment design and installation performs its intended function.

Active AIR-120 2010-07-21
21-49 Gaining Approval Of Seats With Integrated Electronic Components

This AC explains how to gain approval of aircraft seats with integrated electronic components and installed on aircraft. In it, we focus primarily on seats approved to a technical standard order (TSO).

Active AIR-120 2011-02-09